140 - Add CONTRIBUTING

CONTRIBUTING.md

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+# Contributing
+
+Thanks for your interest in FFR. This is a small self-hosted project, issues and
+pull requests are both welcome.
+
+## Reporting issues
+
+Use [Issues](https://forge.lvl0.xyz/lvl0/fedi-feed-router/issues).
+
+For bugs, include what you expected, what happened, and enough detail to
+reproduce it. If a feed is behaving unexpectedly, the feed URL matters most
+because differences in how providers structure their RSS or Atom output are the
+usual cause. Relevant log output helps; `dev-logs` follows the application log.
+
+## Development setup
+
+Requires PHP 8.2+ and Docker. The development environment runs in containers
+defined by `docker/dev/docker-compose.yml`.
+
+On NixOS, or anywhere with Nix installed:
+
+```bash
+git clone https://forge.lvl0.xyz/lvl0/fedi-feed-router.git
+cd fedi-feed-router
+nix-shell
+```
+
+The shell prints the available commands on entry and can start the containers
+for you:
+
+| Command | Description |
+|---------|-------------|
+| `dev-up` | Start the development environment |
+| `dev-down` | Stop the development environment |
+| `dev-restart` | Restart the containers |
+| `dev-rebuild` | Rebuild the images |
+| `dev-shell` | Enter the app container |
+| `dev-artisan <cmd>` | Run an artisan command |
+| `dev-logs` | Follow the application log |
+| `dev-logs-db` | Follow the database log |
+
+Once running:
+
+| Service | URL |
+|---------|-----|
+| App | http://localhost:8000 |
+| Vite | http://localhost:5173 |
+| MariaDB | localhost:3307 |
+| Redis | localhost:6380 |
+
+Without Nix, start the same containers directly from
+`docker/dev/docker-compose.yml`. Contributions improving the setup instructions
+for other platforms are welcome.
+
+## Before opening a pull request
+
+Three checks run in CI, and all three must pass. Run them locally first, from
+inside the app container or anywhere the project's dependencies are available:
+
+```bash
+vendor/bin/pint --test        # code style, Laravel preset
+vendor/bin/phpstan analyse    # static analysis, level 7
+php artisan test              # PHPUnit, Unit and Feature suites
+```
+
+Some conventions:
+
+- **Static analysis.** PHPStan runs at level 7 with a baseline
+  (`phpstan-baseline.neon`) covering pre-existing findings. Don't add baseline
+  entries to silence errors in code you're writing. Fix the cause instead.
+  Inline `@phpstan-ignore` comments aren't used in this project. The baseline is
+  for cases where the analyser or an upstream docblock is wrong, not real bugs.
+- **Tests.** New behaviour needs a test. Tests must run offline, so use fixtures
+  or fakes rather than reaching for the network.
+- **Dependencies.** `composer.lock` is committed. If you change dependencies,
+  commit the updated lockfile alongside `composer.json`.
+
+## Commits
+
+One commit does one thing. Keep each commit passing all three checks so history
+stays bisectable. Separate renames from behaviour changes, and mechanical edits
+from logic.
+
+Commit messages are a single line, referencing the issue they belong to:
+
+```
+141 - Add channel deletion to the Channels page
+```
+
+No body, no trailers.
+
+## License
+
+By contributing, you agree that your contributions are licensed under the
+[GNU AGPL-3.0](LICENSE), the same license as the project.